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Phylum. Starfish belong to the phylum Echinodermata, which is the largest phylum without any members that live on land or in fresh water. Echinoderms have five-point radial symmetry as adults, but are bilaterally symmetrical as larvae. They have an endoskeleton consisting of calcareous plates that often include spines.upiterimages/Photos.com/Getty Images. Although fish and starfish both belong to the kingdom Animalia -- which is the largest division of taxonomic classification -- starfish lack a spine, and therefore belong to a different phylum than true fish.
Many echinoderms have suckers on the ends of their feet that are used to capture and hold prey, and to hold onto rocks in a swift current. Sea Stars Sea stars (group name Stelleroidea) are sometimes called starfish, though they are not real fish (they lack both vertebrae and fins).There are two sub-types of sea stars: 1  Asteroideas are the true sea stars and sun stars. 2  Ophiuroideas are brittle stars and basket stars.ea Stars Sea stars (group name Stelleroidea) are sometimes called starfish, though they are not real fish (they lack both vertebrae and fins). There are two sub-types of sea stars: 1  Asteroideas are the true sea stars and sun stars. 2  Ophiuroideas are brittle stars and basket stars.